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Small ducks , wrong size furnace

I would like an opinion what would make sence.
I had furnace replaced 3 yeas ago by Hvac guy "ex friend" who got me new bryant 100k btus, 1570 cfm. My house 1450 sqf according to software calculation needs 55k-60k furnace. Do i upgrade duck to proper size OR get new proper furnace and still need to upgrade ducks?
House is 25 years old , ducks uninsulated, a/c is 2.5 tons.

Most Of my ducts are definetly wrong size. Example: supply main 8x20 , return 8x16. No return to Second Floor. I had no issue with my heat system ,but noice is unbareble. No zoning for two story house.
Does btu's per room and fan cfm dictates size of ducts (don't mind friction and length of ducts) ???

Your furnace is WAY oversized unless you live in Antarctica. I would guess that a 60K would do the trick for you, but a load calc needs to be done to determine proper sizing. Im suprised you havent had problems with the furnace going out on high limit... Replace the furnace first, smack your friend second, then see if you need addition duck work (haha) once the proper furnace is in place.

If I remember correctly, the fabric tape commonly referred to these days as "duct tape" was created for the military, primarily to seal ammo boxes. I think the grunts nicknamed it "duck tape" since it shed water like a duck. No idea what the "official" name of the tape was.

After the war it became known as "duct tape" as its primary post war use was in the HVAC field.

The History via Google
The first name for Duct Tape was Duck. During World War II the U.S. Military needed a waterproof tape to keep the moisture out of ammunition cases. So, they enlisted the Johnson and Johnson Permacel Division to manufacture the tape. Because it was waterproof, everyone referred to it as “duck” tape (like water off a duck’s back). Military personnel discovered that the tape was good for lots more than keeping out water. They used it for Jeep repair, fixing stuff on their guns, strapping equipment to their clothing... the list is endless.

After the War, the housing industry was booming and someone discovered that the tape was great for joining the heating and air conditioning duct work. So, the color was changed from army green to the silvery color we are familiar with today and people started to refer to it as “duct tape.” Therefore, either name is appropriate.